Abstract
We present results concerning the effect of adding potassium and excess copper (1÷5 wt.%) to the initial powder Y(1-0.2x)Ba(2-0.2x)KxCu3Oy, (x=0÷0.95) on the a.c. complex susceptibility and the development of the microstructure within the YBCO high-temperature superconducting system. The a.c. complex susceptibility Xac=X′-jX″ of KCu-doped YBCO was measured as a function of the temperature the magnetic field amplitude and the KCu concentration. The behavior of the intergrain loss temperature Tm was analyzed through the relationship h-a(1-t)n. The results obtained showed that the presence of K3CuO2 on the grain boundaries changes drastically the intergranular coupling and, within certain concentration limits, improves the critical HTSC characteristics.
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